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Product speci? A guard circuit is provided which blanks the picture tube screen in the absence of deflection current. Direct drive to the deflection coils? Internal blanking guard circuit? Notes 1. SOT; January 07 2. Protection of the output stage is such that the operation of the transistors remains well within the SOAR area in all circumstances at the output pin, pin 5. This is obtained by the cooperation of the thermal protection circuit, the current-voltage detector and the short circuit protection.
Special measures in the internal circuit layout give the output transistors extra solidity, this is illustrated in Fig. The same curves also apply for the upper output device. The supply for the output stage is fed to pin 6 and the output stage ground is connected to pin 4. Driver and switching circuit Pin 1 is the input for the driver of the output stage.
The signal at pin 1 is also applied to pin 3 which is the input of a switching circuit pin 1 and 3 are connected via external resistors. This switching circuit rapidly turns off the lower output stage when the flyback starts and it, therefore, allows a quick start of the flyback generator.
The maximum required input signal for the maximum output current peak-to-peak value of 3 A is only 3 V, the sum of the currents in pins 1 and 3 is then maximum 1 mA. Flyback generator During scan, the capacitor between pins 6 and 8 is charged to a level which is dependent on the value of the resistor at pin 8 see Fig. When the flyback starts and the voltage at the output pin pin 5 exceeds the supply voltage, the flyback generator is activated. The supply voltage is then connected in series, via pin 8, with the voltage across the capacitor during the flyback period.
This implies that during scan the supply voltage can be reduced to the required scan voltage plus saturation voltage of the output transistors. The amplitude of the flyback voltage can be chosen by changing the value of the external resistor at pin 8. Guard circuit When there is no deflection current, for any reason, the voltage at pin 8 becomes less than 1 V, the guard circuit will produce a d.
This voltage can be used to blank the picture tube, so that the screen will not burn in. Voltage stabilizer The internal voltage stabilizer provides a stabilized supply of 6 V to drive the output stage, so the drive current is not affected by supply voltage variations. Pins 2 and 4 are externally connected to ground. Voltages Output voltage Supply voltage Supply voltage output stage Input voltage Input voltage switching circuit External voltage at pin 7 Currents Repetitive peak output current Non-repetitive peak output current note 1 Repetitive peak output current of?
Pins 2 and 4 externally connected to ground. I8 V? A V V sat V sat? I8 p-p? V MAX. V V Ri7 V 4,1 3,4 0,95? V Tj Rth j-mb Ptot Go f ? The maximum supply voltage should be chosen so that during flyback the voltage at pin 5 does not exceed 60 V. When V is 13 V and no load at pin 5. See Fig. When pin 3 is driven separately from pin 1. During normal operation the voltage V may not be lower than 1,5 V. If guard circuit is active. With a 22 pF capacitor between pins 1 and 5.
Plastic or metal protrusions of 0. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board.
However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. This text gives a very brief insight to a complex technology. The total contact time of successive solder waves must not exceed 5 seconds.
The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature Tstg max.
If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit.
Repairing soldered joints Apply a low voltage soldering iron less than 24 V to the lead s of the package, below the seating plane or not more than 2 mm above it. Stress above one or more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the speci?
Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the speci? Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. This data sheet contains target or goal speci?
This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains?
The data in this speci? For detailed information see the relevant data sheet or data handbook. March
TDA3654 Vertical Deflection IC
TDA3654 TDA 3654 Vertical Deflection and Guard Circuit Philips